| 摘要 |
PURPOSE:To simply its operation to enable diagnosis to be performed with high accuracy by setting a sample point and making the point unchangeable so as to perform diagonal linear scanning at a desired deflected angle in a Doppler mode. CONSTITUTION:After a sample point has been set in a random position on a transmission line for ultrasonic beams sent from a linear scanning probe 10 to a person to be tested, and the deflection angle of an ultrasonic beam resetted, the sample point is fixed in its preset position on the person. The set value of the sample point is changed so that the position will be the sample point of the ultrasonic beam under the deflection angle resetted. The frequency of a signal received at the sample point is analysed to find its Doppler shift frequency, according to which a D-mode processor calculates information on the velocity of the blood flow of the person. Operation of the device is thus simplified to enable diagnosis to be performed with high accuracy. |
